Consolidated Statements of Cash Flows (Parenthetical) - shares	12 Months Ended
Oct. 31, 2019	Oct. 31, 2018
3.75% Convertible Senior Notes due October 15, 2018
Interest rate on convertible notes	3.75%	3.75%
Debt conversion, shares issued (in shares)		3,038,208
4.0% Convertible Senior Notes due March 15, 2015
Interest rate on convertible notes		4.00%
Debt conversion, shares issued (in shares)		9,197,943
3.75% Convertible Senior Notes due October 15, 2018 (New)
Interest rate on convertible notes	3.75%
Debt conversion, shares issued (in shares)	1,585,140

The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586

Name:	us-gaap_DebtConversionConvertedInstrumentSharesIssued1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration